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Alarcón-Enos J, Muñoz-Núñez E, Gutiérrez M, Quiroz-Carreño S, Pastene-Navarrete E, Céspedes Acuña C. Dyhidro-β-agarofurans natural and synthetic as acetylcholinesterase and COX inhibitors: interaction with the peripheral anionic site (AChE-PAS), and anti-inflammatory potentials. J Enzyme Inhib Med Chem 2022; 37:1845-1856. [PMID: 35815566 PMCID: PMC9278454 DOI: 10.1080/14756366.2022.2091554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
In order to find molecules of natural origin with potential biological activities, we isolate and synthesise compounds with agarofuran skeletons (epoxyeudesmanes). From the seeds of Maytenus disticha and Maytenus magellanica we obtained six dihydro-β-agarofurans, and by means of the Robinson annulation reaction we synthesised five compounds with the same skeleton. The structures were established on the basis of NMR, IR, and MS. The evaluated compounds showed inhibitory activity on the acetylcholinesterase enzyme and on the COX enzymes. Compound 4 emerged as the most potent in the acetylcholinesterase inhibition assay with IC50 17.0 ± 0.016 µM on acetylcholinesterase (AChE). The compounds evaluated were shown to be selective for AChE. The molecular docking, and the propidium displacement assay suggested that the compounds do not bind to the active site of the enzyme AChE, but rather bind to the peripheral anionic site (PAS) of the enzyme, on the other hand, the natural compound 8, showed the best inhibitory activity on the COX-2 enzyme with an IC50 value of 0.04 ± 0.007 µM. The pharmacokinetic profile calculated in silico using the SWISSADME platform shows that these molecules could be considered as potential drugs for the treatment of neurodegenerative diseases such as AD.
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Affiliation(s)
- Julio Alarcón-Enos
- Departamento de Ciencias Básicas, Universidad del Bío-Bío, Chillán, Chile
| | - Evelyn Muñoz-Núñez
- Departamento de Ciencias Básicas, Universidad del Bío-Bío, Chillán, Chile
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Liu H, Zhu N, Li M, Huang X, Wu P, Hu Z, Shuai J. Induced fluorescent enhancement of protein-directed synthesized gold nanoclusters for selective and sensitive detection of flame retardants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 713:136488. [PMID: 31955081 DOI: 10.1016/j.scitotenv.2019.136488] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/31/2019] [Accepted: 12/31/2019] [Indexed: 06/10/2023]
Abstract
Organophosphate flame retardants (OPFRs), typical toxic and hazardous pollutants, are called for new detection approaches to avoid laborious synthetic procedures and large and expensive instruments. Hence, a novel fluorescent probe was constructed for quantitative detection of OPFRs via heightening the fluorescence of acetylcholinesterase synthesized gold nanoclusters (AChE-AuNCs). The as-prepared AChE-AuNCs exhibited high fluorescence emission at about 398 nm with the average particle size of about 1.60 nm. When the AChE-AuNCs was applied to the proposed fluorescent detection, excellent sensitivity with wide linear range (50-1000 ng L-1) and low detection limit (30 ng L-1) for TClPP with the response time less than 1 h were achieved. The fluorescent probe could be extended to detect other three types of OPFRs (TEP, TPHP, and TBOEP) and the target pollutants could be detectable in the presence of halogenated flame retardants. The mechanism might be mainly contributed by the interaction between OPFRs and AChE-AuNCs restricting internal vibration consumption of their capping ligands. The proposed detection approach could be easily operated and was not involved with other intermediate products. Therefore, AChE-AuNCs could be a promising fluorescent probe for rapid, selective and sensitive detection of OPFRs and even in the practical application.
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Affiliation(s)
- Huangrui Liu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China
| | - Nengwu Zhu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, Guangdong, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, Guangdong, PR China.
| | - Minting Li
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China
| | - Xixian Huang
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China
| | - Pingxiao Wu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou 510006, Guangdong, PR China; Guangdong Environmental Protection Key Laboratory of Solid Waste Treatment and Recycling, Guangzhou 510006, Guangdong, PR China
| | - Zhilin Hu
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China
| | - Jiangtao Shuai
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, PR China
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Islam MM, Rohman MA, Gurung AB, Bhattacharjee A, Aguan K, Mitra S. Correlation of cholinergic drug induced quenching of acetylcholinesterase bound thioflavin-T fluorescence with their inhibition activity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 189:250-257. [PMID: 28822269 DOI: 10.1016/j.saa.2017.08.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 07/17/2017] [Accepted: 08/02/2017] [Indexed: 06/07/2023]
Abstract
The development of new acetylcholinesterase inhibitors (AChEIs) and subsequent assay of their inhibition efficiency is considered to be a key step for AD treatment. The fluorescence intensity of thioflavin-T (ThT) bound in the active site of acetylcholinesterase (AChE) quenches substantially in presence of standard AChEI drugs due to the dynamic replacement of the fluorophore from the AChE active site as confirmed from steady state emission as well as time-resolved fluorescence anisotropy measurement and molecular dynamics simulation in conjunction with docking calculation. The parametrized % quenching data for individual system shows excellent correlation with enzyme inhibition activity measured independently by standard Ellman AChE assay method in a high throughput plate reader system. The results are encouraging towards design of a fluorescence intensity based AChE inhibition assay method and may provide a better toolset to rapidly evaluate as well as develop newer AChE-inhibitors for AD treatment.
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Affiliation(s)
- Mullah Muhaiminul Islam
- Center for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong 793 022, India
| | - Mostofa Ataur Rohman
- Center for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong 793 022, India
| | - Arun Bahadur Gurung
- Department of Biotechnology & Bio-informatics, North-Eastern Hill University, Shillong 793 022, India
| | - Atanu Bhattacharjee
- Department of Biotechnology & Bio-informatics, North-Eastern Hill University, Shillong 793 022, India
| | - Kripamoy Aguan
- Department of Biotechnology & Bio-informatics, North-Eastern Hill University, Shillong 793 022, India
| | - Sivaprasad Mitra
- Center for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong 793 022, India.
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